Display screen with an icon



FIG. 1 is a front view of a display screen with an icon showing the new design; and,

FIG. 2 is a front view of an alternative embodiment of a display screen with an icon showing the design.

The broken line showing of the display screen is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a display screen with an icon, as shown and described. 